<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>child-3</title>
    <script>
        const DATE_NOW     = Date.now();
        const LOCK_TIMEOUT = 10000;

        while (Date.now() < DATE_NOW + LOCK_TIMEOUT) {
        }
    </script>
</head>
<body>
    <h1>child-3</h1>
</body>
</html>
